Sprinkle shrimp with remaining 1/4 teaspoon each of salt and pepper, then add to wine mixture and cook, stirring, until opaque, 1 to 2 minutes. Transfer one third of shrimp to a blender, along with enough sauce to blend, and purée until smooth. Stir purée into remaining sauce in skillet. Add cream, lemon juice, and any juices in baking pan and cook over moderately low heat until whole shrimp are just cooked through, about 1 minute.